Carboxylic acid isomer-directed synthesis of CdS nanocluster isomers
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Addn. of alkenyldimethoxyboranes to EtCHO or BzH proceeded almost completely stereospecifically; e.g., (Z)-2-butenyldimethoxyborane and EtCHO gave 62% R*,R*-EtCH(OH)CHMeCH:CH2 of 96% isomer purity; while the (E)-borane gave the R*,S* isomer in 97% purity. ...
Metalation at the allylic site (Me group) of (Z)-RCH:CHMe (R = alkyl) is more rapid than with the E-isomers regardless of the configuration in which the resultant organometallic is more thermodn. stable. Thus, (Z)-Me3CCH:CHCH2K is formed 15 times faster th ...
Comparison of results obtained from 1,1′- and 1,3-disubstituted ferrocenes clearly demonstrates the influence of structural isomerism on the mesomorphic properties. ...
The alcoholate-promoted dehydrohalogenation of 5-nonyl fluoride and cyclododecyl fluoride, typical straight-chain and, resp., medium-size cyclic substrates, leads to cis- and trans-alkenes in an approx. ratio of 1:3. With bulky bases such as lithium diisop ...
A sulfone mediated approach presumably did produce Me a-fluorochrysanthemate I but, if formed, the latter immediately underwent dehydrofluorination under the strongly basic reaction conditions. The cis- and trans-isomers of Me b- and g-fluorochysanthemates ...
A new method called selective inversion soft COSY (SIS-COSY) is described. By using this method the coupling between active and passive spins can be detected. The pulse sequence consists of 3 semiselective 270 Deg pulses, which gives a spectrum consisting ...
Treatment of optically active (PrCHBr)2CH2 with Li-Hg or biphenyl-Li gave 46:54 or 59:51, resp., cis- and trans-1,2-dipropylcyclopropane (I). The original (R,R)-configuration at both chiral centers was inverted in the course of the cyclization reaction lea ...
PrCHBrCH2CHPrR (R = Br, F, or I) were converted into 1,2-dipropylcyclopropane by various metallic or organometallic reducing agents. Normally, cyclization occurred in a stereoconvergent manner, i.e. diastereomeric dihalides usually led to the same mixt. of ...
Reaction of olefins with CHFBr2 and BuLi gave stereospecific cis and trans isomers of alkyl-substituted fluorocyclopropanes (I, R, R1, R2, R3 = H, Me, Pr, C5H11). The addn. was also stereoselective with preferred formation of the syn isomers of I. Therefor ...
