A. I. D'yachenko

New synthesis of bicyclo(1. 1. 0)butane hydrocarbons

ConclusionsA new general synthesis is proposed for bicyclo[1.1.0]butanes, by 1,3-cyclization of 1-bromo-chloromethylcyclopropanes, and a two-step synthesis of the latter from available allyl chlorides has been developed.

Simple preparative method for the synthesis of monobromocyclopropanes

ConclusionsA simple method has been developed for the reduction of gem-dibromocyclopropanes to give monobromocyclopropanes by the action of a readily available nonmetallic reagent, sodium hydrosulfite, at 90–100‡C in a mixture of 2-propanol, water, and DMF. This method gives 75–86% yields of the desired products and the complete absence of the products of complete reduction.

Unstable haloorganolithium compounds

1. n nAccording to the data of the PMR spectra, low-temperature cryoscopy, and differential thermal analysis,o-fluorophenyllithium in the presence of no less than equivalent amounts of an ether in hydrocarbon solutions at temperatures from −100 to −40° exists in the form of a tetrasolvated tetramer (o-FC6H4Li)4 (R2O)4. n n n n n2. n nThe similarity of the PMR spectra of etherates ofo-fluorophenyllithium and phenyllithium indicates that phenyllithium and probably other ArLi as well also form tetramer complexes of the (ArLi)4L4 type in the presence of ethers or trialkylamines. n n n n n3. n nThe steric structures of etherates of aromatic lithium compounds and the mechanism of the decomposition ofo-fluorophenyllithium with the formation of dehydrobenzene were discussed.