نتایج جستجو برای: acetylenic diesters
تعداد نتایج: 1161 فیلتر نتایج به سال:
Isothiourea HBTM-2.1 catalyzes the asymmetric Michael addition/lactonization of aryl- and alkenylacetic acids using α-keto-β,γ-unsaturated phosphonates as α,β-unsaturated ester surrogates, giving access to a diverse range of stereodefined lactones or enantioenriched functionalized diesters upon ring-opening.
There is considerable concern about pollution of surface waters with P. Although most of the research has focused on inorganic P in surface runoff, it has recently become possible to easily follow the fate of soluble organic P forms in soils and waters. Two experiments were performed to compare the relative mobility and soil fixation affinity of orthophosphate monoesters, orthophosphate diester...
The effect of 1, l-diphenyl-2-propynyl cyclohexylcarbamate on hemagglutinin and hemolysin formation by mice in response to sheep red blood cells has been investigated. A single LDio dose of drug was administered at various times before or after immunization and the hemaggluti nin response was evaluated. With this dose the drug, de pending on time of administration in relation to primary immune ...
Selected hetaryl and aryl thioketones react with acetylenecarboxylates under thermal conditions in the presence of LiClO4 or, alternatively, under high-pressure conditions (5 kbar) at room temperature yielding thiopyran derivatives. The hetero-Diels-Alder reaction occurs in a chemo- and regioselective manner. The initially formed [4 + 2] cycloadducts rearrange via a 1,3-hydrogen shift sequence ...
Two pairs of diastereoisomeric acetylenic norlignan compounds with PhCH(OR(1))CH(OR(2))CH(2)C triple bond CPh skeleta: (1R, 2R)-1-O-methylnyasicoside (1) and (1S, 2R)-1-O-methylnyasicoside (2), and (1R, 2R)-crassifogenin D (3) and (1S, 2R)- crassifogenin D (4), were isolated from the ethanolic extract of rhizomes of Curculigo crassifolia. Compounds 3 and 4 are new and their structures were eluc...
This study was carried out to investigate the short term toxicity of nine phthalate diesters including di-2 (ethylhexyl) phthalate (DEHP) , di (n-butyl) phthalate (DBP) , di-n-octyl phthalate (DnOP) , diethyl phthalate (DEP) , butylbenzyl phthalate (BBP) , dimethyl phthalate (DMP) , di-isodecyl phthalate (DIDP) , diundecyl phthalate (DUP) , and di-isononyl phthalate (DINP) and five phthalate mo...
The electrochemical behaviour of some alkyl meta-substituted (R = Me or Pr) diesters and dithioic S,S9-diesters of pyridine and benzene (trivial names dipicolinate and isophthalate esters) have been studied by cyclic voltammetry (scan rates = 0.1–50 V s) in acetonitrile with 0.1 M tetrabutylammonium hexafluorophosphate as the supporting electrolyte. The cyclic voltammetry data can be interprete...
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