Results 51 to 60 of about 3,489 (193)
The Pyroglutamate Hydantoin Rearrangement [PDF]
European Journal of Organic Chemistry, 2006 AbstractWhen a mixture of a pyroglutamate and an isocyanate in THF is treated with NaH, a ring transformation occurs leading to functionalised hydantoins. The novel reaction involves a ring‐closing ring‐opening sequence providing a new and straightforward access to an interesting class of heterocyclic compounds.
Nicolai Dieltiens +6 more
openaire +1 more source
Tautomeric Equilibria Studies by Mass Spectrometry [PDF]
, 2008 Tautomerism in organic chemistry has been extensively studied in condensed phase by spectrometric methods, mainly by IR and NMR techniques. Mass spectrometry studies start 40 years ago but just recently it has been recognized the importance of the mass ...
Eduardo A. Castro +3 more
core +1 more source
A systematic approach to diverse, lead-like scaffolds from α,α-disubstituted amino acids. [PDF]
, 2015 A powerful strategy for the efficient lead-oriented synthesis of novel molecular scaffolds is demonstrated. Twenty two scaffolds were prepared from just four α-amino acid-derived building blocks and a toolkit of six connective reactions.
Adam Nelson +27 more
core +2 more sources
Contact Dermatitis, EarlyView.The overall prevalence of sensitization to FA/FRs was 1.9% (48/2592). ACD was diagnosed in 37.5% (18/48), comprising non‐occupational ACD (83.3%) and occupational ACD (16.7%). FA 1%–2% aq. failed to detect FR sensitisation in 31.9% (n = 15/47) and FR‐induced ACD in 35.3% (n = 6/17) of patients.
Esen Özkaya +2 more
wiley +1 more source
Electronic effects in the cyclocondensation of benzil [PDF]
, 2010 Electronic effects are important directing forces in the course of chem. reactions. Small differences in these effects can bring about considerable changes in the results of very similar reactions.
Nagendrappa, G.
core +1 more source
Sinteza, spektroskopska karakterizacija i ab initio istraživanje tioanaloga spirohidantoina [PDF]
, 2005 Dithioanalogues of cycloalkanespiro-5-hydantoins were prepared by reaction of the respective spirohydantoins with Lawesson’s reagent or P4S10. Cycloalkanespiro-5-(2-thiohydantoins) and cycloalkanespiro-5-(4-hydantoins) were also synthesized from ...
Galya Ivanova +5 more
core +1 more source
Drug interaction in the emergency service [PDF]
, 2013 OBJECTIVE: To identify the occurrence of potential drug interactions in prescriptions for adult patients admitted to the Emergency Department of Hospital São Paulo. METHODS: A cross-sectional and descriptive study.
Batista, Ruth Ester Assayag +3 more
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Journal of Intellectual Disability Research, EarlyView.ABSTRACT Background Family members' involvement in the care for their relative often continues after their relative has moved out of the family home. However, little is known about the needs of family members when collaborating specifically with support staff caring for their relative.
Frances R. Vereijken +3 more
wiley +1 more source
Reactions with N-(1-benzotriazolylcarbonyl)-amino acids. IV. The use of N-(1-benzotriazolylcarbonyl)-amino acid derivates in peptide synthesis [PDF]
, 1990 The use of the 1-benzotriazolylearbonyl-(Bte)-group as an N-protecting and N-activating group in the synthesis of peptides was investigated. Removal of the Btc group from N-Btc-amino acids, their esters and amides under acidic conditions is possible, but
Butula, Ivan +2 more
core +3 more sources
The Aminobarbituric Acid−Hydantoin Rearrangement [PDF]
The Journal of Organic Chemistry, 2003 AbstractFor Abstract see ChemInform Abstract in Full Text.
Manuela, Meusel +3 more
openaire +2 more sources