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https://www.readbyqxmd.com/read/29334464/asymmetric-synthesis-of-secondary-and-tertiary-propargylic-alcohols-by-umpolung-of-acetylenic-sulfones-and-ortho-sulfinyl-carbanions
#1
Ricardo I Rodriguez, Elsie Ramírez, Francisco Yuste, Ruben Sanchez-Obregon, José Alemán
The generation of diasteromerically enriched secondary benzyl propargyl alcohols by the asymmetric addition of ortho-sulfinylbenzyl carbanions to sulfonylacetylene derivatives via formation of Csp-Csp3 bond is described. This reaction proceeds through an unusual α-attack (anti-Michael addition) of the ortho-sulfinylbenzyl carbanions, followed by elimination of the arylsulfonyl moiety. The scope of this alkynylation reaction is also discussed. Moreover, the development of a new approach for the synthesis of optically active tertiary benzylpropargyl alcohols is described, discussing the possible stereocourse of the reaction so as the influence of the ether 18-crown-6 and steric importance of acetylenic substituent...
January 15, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29334440/multifactorial-splenomegaly
#2
Jay Allison, Rachel Sunne, Mark Huntington
Splenomegaly is an unusual finding among North Americans, but is commonly seen in many parts of the world. Increasingly, it can be encountered locally among recent immigrant and refugee populations. A broad differential diagnosis is required. We report the case of a 33-year-old refugee with multiple potential causes for splenomegaly. Empiric treatment of one of the infectious contributors to his splenomegaly resulted in a significant improvement of his quality of life, illustrating the importance of a thorough evaluation of potential causes of splenomegaly, especially in refugee and immigrant populations...
December 2017: South Dakota Medicine: the Journal of the South Dakota State Medical Association
https://www.readbyqxmd.com/read/29334394/substitution-of-the-laser-borane-anti-b18h22-with-pyridine-a-structural-and-photophysical-study-of-some-unusually-structured-macropolyhedral-boron-hydrides
#3
Michael G S Londesborough, Jiří Dolanský, Tomáš Jelínek, John D Kennedy, Ivana Císařová, Robert D Kennedy, Daniel Roca-Sanjuán, Antonio Francés-Monerris, Kamil Lang, William Clegg
Reaction of anti-B18H221 with pyridine in neutral solvents gives sparingly soluble B16H18-3',8'-Py23a as the major product (ca. 53%) and B18H20-6',9'-Py22 (ca. 15%) as the minor product, with small quantities of B18H20-8'-Py 4 (ca. 1%) also being formed. The three new compounds 2, 3a and 4 are characterized by single-crystal X-ray diffraction analyses and by multinuclear multiple-resonance NMR spectroscopy. Compound 2 is of ten-vertex nido:ten-vertex arachno two-atoms-in-common architecture, long postulated for a species with borons-only cluster constitution, but previously elusive...
January 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29334359/electronic-and-optical-properties-of-spinel-zinc-ferrite-i-ab-initio-i-hybrid-functional-calculations
#4
Daniel Fritsch
Spinel ferrites in general show a rich interplay of structural, electronic, and magnetic properties. Here, we particularly focus on zinc ferrite (ZFO), which has been observed experimentally to crystallise in the cubic <i>normal</i> spinel structure. However, its magnetic ground state is still under dispute. In addition, some unusual magnetic properties in ZFO thin films or nanostructures have been explained by a possible partial cation inversion and a different magnetic interaction between the two cation sublattices of the spinel structure compared to the crystalline bulk material...
January 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29334154/nano-titanium-monoxide-crystals-and-unusual-superconductivity-at-11-k
#5
Jijian Xu, Dong Wang, Heliang Yao, Kejun Bu, Jie Pan, Jianqiao He, Fangfang Xu, Zhanglian Hong, Xiaobo Chen, Fuqiang Huang
Nano TiO2 is investigated intensely due to extraordinary photoelectric performances in photocatalysis, new-type solar cells, etc., but only very few synthesis and physical properties have been reported on nanostructured TiO or other low valent titanium-containing oxides. Here, a core-shell nanoparticle made of TiO core covered with a ≈5 nm shell of amorphous TiO1+x is newly constructed via a controllable reduction method to synthesize nano TiO core and subsequent soft oxidation to form the shell (TiO1+x )...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29333908/false-positive-acetylcholine-receptor-antibodies-in-a-case-of-unilateral-chronic-progressive-external-ophthalmoplegia-case-report-and-review-of-literature
#6
Rehan Rajput, Amun Sachdev, Nizar Din, Erika Marie Damato, Aidan Murray
METHODS: We present a rare case with atypical presenting features of unilateral CPEO with a false positive Acetylcholine Receptor Antibody (AchRA) test resulting in diagnostic delay. We illustrate the unilateral nature of this case and demonstrate the caveats of performing myogenic ptosis correction in such patients. We also discuss the differential diagnosis of false positive AchRA, a test commonly performed in the investigation of ptosis. RESULTS: A 34-year old female presented with a more than 3-year history of slowly-progressive, unilateral, right-sided restriction in eye movements and ptosis...
January 15, 2018: Orbit
https://www.readbyqxmd.com/read/29333888/primary-diffuse-large-b-cell-lymphoma-of-the-ciliary-body
#7
Hayyam Kiratli, Abdullah Ağın, Berrin Büyükeren, Figen Söylemezoğlu
PURPOSE: To report an unusual case of an eye with primary ciliary body lymphoma which came to enucleation allowing detailed histopathological examination. METHODS: A 50-year-old man presented with a painful loss of vision in the left eye. The clinical, imaging, and immunohistopathological features of this case were reviewed. RESULTS: The vision in the left eye was light perception. There were keratic precipitates, an irregular and thickened iris with neovascularization...
January 15, 2018: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/29333841/-granular-cell-tumor-of-the-larynx-in-the-child-case-report
#8
Giselle Cuestas, Verónica Rodríguez, Flavia Doormann, Patricio Bellia Munzón, Gastón Bellia Munzón
Laryngeal tumors are uncommon in children, accounting only for 2% of the laryngeal anomalies. Ninety-eight percent are benign; the most frequent ones are recurrent respiratory papillomatosis and haemangioma. Granular cell tumor, also called Abrikossoff tumor, is an unusual benign neoplasm, especially in the larynx. Clinical manifestations depend on the size and location of the tumor. Dysphonia is the main presenting symptom. The diagnosis is confirmed by the biopsy. The treatment of choice is surgery. We present a 9-year-old girl with dysphonia and exertion dyspnea due to a granular cell tumor of the larynx, and we emphasize the importance of considering the endoscopic evaluation of the airway in every child with progressive or persistent dysphonia in order to determine the etiology...
February 1, 2018: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/29333622/metabolic-acidosis-and-anaemia-associated-with-dorzolamide-in-a-patient-with-impaired-renal-function
#9
Iva Hoffmanová, Daniel Sánchez
Topical carbonic anhydrase inhibitors (CAI), used for treatment of glaucoma, are generally regarded as safe and unconnected with systemic side effects. We report an unusual case of fatigue, metabolic acidosis, and normocytic anaemia associated with ocular administration of the CAI, dorzolamide, in a patient with impaired renal function. In chronic kidney disease, where CAI elimination may be decreased, and patients prone to develop metabolic acidosis, systemic absorption of ocular administered CAI could lead to rare, but potentially serious adverse reaction, that are a consequence of inhibition of extraocular carbonic anhydrase isoenzymes...
January 14, 2018: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29333432/cytomegalovirus-associated-pulmonary-exacerbation-in-patients-with-cystic-fibrosis
#10
Akhil Sawant, Giulia Spoletini, Paul Whitaker, Christine Etherington, Ian Clifton, Daniel Peckham
CMV is an unusual cause of pulmonary exacerbation in immunocompetent individuals with CF http://ow.ly/Rdds30hlnjV.
January 2018: ERJ Open Research
https://www.readbyqxmd.com/read/29333033/gastric-teratoma-an-unusual-presentation-and-location
#11
Jayalaxmi S Aihole, M Narendra Babu, Vinay Jadhav, Deepak Javaregowda
The gastric teratoma is a rare tumor that usually presents as an abdominal mass, with or without features of gastric outlet obstruction. We report two cases of gastric teratoma; one - mature in a male neonate and another - ruptured immature gastric teratoma in a female neonate.
October 2017: Indian Journal of Medical and Paediatric Oncology
https://www.readbyqxmd.com/read/29333029/flagellate-rash-an-unusual-complication-of-bleomycin-therapy-a-case-report-with-brief-review-of-literature
#12
Chaturbhuj Agrawal, Vineet Talwar, Rajeev Saini, Pradeep Babu
Chemotherapy-induced skin rashes are common toxicities encountered which require careful assessment and evaluation as rashes could be a manifestation of primary malignancy itself and a variety of drugs used in combination further complicate the clinical scenario. Bleomycin is an anticancer antibiotic derived from Streptomyces verticillus and has been commonly used in the treatment of Hodgkin's disease, germ cell tumors and for pleurodesis. There are various dermatological adverse effects of bleomycin which have been previously reported in literature including skin peeling, hyperkeratosis, nail bed changes, Raynaud's phenomenon, and palmoplantar desquamation...
October 2017: Indian Journal of Medical and Paediatric Oncology
https://www.readbyqxmd.com/read/29333025/primary-leiomyosarcoma-of-breast-presenting-with-metastasis-an-atypical-presentation-with-dismal-prognosis
#13
Garima Singh, Deepti Sharma, Surbhi Goyal
Leiomyosarcoma is an extremely uncommon subtype of breast sarcoma, with <50 cases reported in the English literature till date. Patients usually present at an early stage and follow an indolent course. We reported an unusual case of leiomyosarcoma of breast in a post -menopausal female,presented with right side breast lump and pain right side hip. Histomorphological evaluation and immunohistochemistry confirmed the diagnosis. The patient received palliative radiotherapy 20 Gy in 5 fractions to right iliac bone and was started on chemotherapy comprising of docetaxel and epirubicin...
October 2017: Indian Journal of Medical and Paediatric Oncology
https://www.readbyqxmd.com/read/29332994/application-of-the-advanced-distillation-curve-method-to-the-comparison-of-diesel-fuel-oxygenates-2-5-7-10-tetraoxaundecane-tou-2-4-7-9-tetraoxadecane-tod-and-ethanol-fatty-acid-methyl-ester-fame-mixtures
#14
Jessica L Burger, Tara M Lovestead, Mark LaFollette, Thomas J Bruno
Although they are amongst the most efficient engine types, compression-ignition engines have difficulties achieving acceptable particulate emission and NOx formation. Indeed, catalytic after-treatment of diesel exhaust has become common and current efforts to reformulate diesel fuels have concentrated on the incorporation of oxygenates into the fuel. One of the best ways to characterize changes to a fuel upon the addition of oxygenates is to examine the volatility of the fuel mixture. In this paper, we present the volatility, as measured by the advanced distillation curve method, of a prototype diesel fuel with novel diesel fuel oxygenates: 2,5,7,10-tetraoxaundecane (TOU), 2,4,7,9-tetraoxadecane (TOD), and ethanol/fatty acid methyl ester (FAME) mixtures...
August 17, 2017: Energy & Fuels: An American Chemical Society Journal
https://www.readbyqxmd.com/read/29332969/c12h12-interconversions-two-non-pyrolytic-syntheses-of-tricyclo-5-3-2-04-8-dodeca-2-5-9-11-tetraene
#15
Ihsan Erden, Cindy J Gleason
Herein, we describe two independent and non-pyrolytic syntheses of an important C12H12 hydrocarbon which had been prepared previously by gas phase thermolysis of compound 6. The first method is based on an unusual dipolar cycloaddition of dichloroketene onto bullvalene. After reductive dechlorination, a Shapiro-Heath reaction of the tosylhydrazone gave the title compound. Alternatively, compound 13 is also obtained from its isomer 6 by a Ag+ catalyzed reaction.
January 17, 2018: Tetrahedron Letters
https://www.readbyqxmd.com/read/29332781/pediatric-extracorporeal-cardiopulmonary-resuscitation-patient-with-traumatic-subarachnoid-hemorrhage-and-takotsubo-syndrome
#16
Thomas E Pearson, Meg A Frizzola, Marc A Priest, Monica A Rochman, Curtis D Froehlich
Takotsubo syndrome is rare in pediatric patients but must be considered in patients with subarachnoid hemorrhage with pulmonary edema and cardiomyopathy. A systematic, collaborative approach is needed to facilitate emergent transfer of patients where extracorporeal cardiopulmonary resuscitation (e-CPR) is used as a lifesaving measure. Extracorporeal membrane oxygenation (ECMO) use in transport requires preplanning, role delineation, resources, and research efforts to be successful. We present an unusual transport case of successful e-CPR/ECMO treatment of Takotsubo syndrome in a 12-year-old boy with an isolated traumatic intracranial injury, cardiomyopathy with pulmonary edema, and multiple cardiac arrests...
January 2018: Air Medical Journal
https://www.readbyqxmd.com/read/29332471/fatal-exertional-heat-stroke-and-american-football-players-the-need-for-regional-heat-safety-guidelines
#17
Andrew J Grundstein, Yuri Hosokawa, Douglas J Casa
CONTEXT:   Weather-based activity modification in athletics is an important way to minimize heat illnesses. However, many commonly used heat-safety guidelines include a uniform set of heat-stress thresholds that do not account for geographic differences in acclimatization. OBJECTIVE:   To determine if heat-related fatalities among American football players occurred on days with unusually stressful weather conditions based on the local climate and to assess the need for regional heat-safety guidelines...
January 13, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29332001/problem-solving-in-clinical-practice-a-baby-who-won-t-stop-bleeding
#18
Emma Dyer, Benjamin Cahill
Spontaneous bleeding in the neonatal period is an unusual presentation, and yet one that can pose a challenge of both diagnosis and management to the general paediatrician. This case chronicles the diagnostic journey of an 8-day-old baby who presented with unrelenting bleeding from the umbilical cord and explores the clinical approach to bleeding in a neonate.
January 13, 2018: Archives of Disease in Childhood. Education and Practice Edition
https://www.readbyqxmd.com/read/29331441/poor-oral-intake-in-a-late-preterm-twin-usual-symptom-with-an-unusual-diagnosis
#19
Ajay Pratap Singh, Rula Balluz, Praveen Chandrasekharan
BACKGROUND: At three weeks of age, a previous 34 weeks' gestation male infant (twin A) was transferred to our regional perinatal center (RPC) with complaints of poor oral feeding and intermittent tachypnea. Twin B was discharged at 37 weeks with an uneventful course. CASE: Twin A briefly required respiratory support but continued to have difficulty transitioning from gavage to oral feeding. Initially, his inability to feed orally was thought to be secondary to nasal congestion and prematurity, but with worsening respiratory distress he was transferred for further evaluation and management...
January 10, 2018: Heart & Lung: the Journal of Critical Care
https://www.readbyqxmd.com/read/29330865/a-case-of-radiation-induced-osteosarcoma-of-the-skull-presenting-as-a-cutaneous-epidermotropic-tumour-with-a-short-latent-period
#20
E Rashidghamat, E Calonje
Radiation induced sarcoma is an unusual but well documented tumor. The frequency of radiation induced sarcoma of the head and neck region has been reported as 0.143%. In the literature the median interval between irradiation and development of sarcoma is 11 years. Cases of RIS with a short latent period i.e. less than four years are rare. We report a case of a 34 year-old female who developed an osteosarcoma of the scalp, over a previous craniotomy scar, three years after excision of a frontal anaplastic oligodendroglioma which had been followed by a course of 6 weeks radiotherapy (58 Gy) and 6 cycles of Temozolomide...
January 13, 2018: Journal of Cutaneous Pathology
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