Showing papers by "Kalpattu K. Balasubramanian published in 1987"
TL;DR: In this paper, the synthesis and Claisen rearrangement of methyl γ-aryloxycrotonates have been investigated and a number of them have been successfully rearranged to a mixture of Z and E 3-ethylidenebenzofuran-2(3H)ones in refluxing ethylene glycol.
15 citations
TL;DR: In this article, a mass spectral fragmentation of 4-chloro-3-(N-aryliminomethyl) (2H) benzopyrans and benzothiopyrans was proposed.
Abstract: Intramolecular substitutions leading to cyclizations with the ejection of chlorine have been noticed during mass spectral fragmentation of 4-chloro-3-(N-aryliminomethyl) (2H) benzopyrans and benzothiopyrans. Very interesting ortho effects involving intramolecular substitutions have also been observed in 6-methyl-4-diloro-3-[N-(2-methoxyphenyliminomethyl)] (2H) benzopyran and 6-methyl-4-chloro-3-[N-(2-chlorophenyliminomethyl)]-(2H) benzopyran. The proposed fragmentation mechanisms have been supported by the accurate mass measurements and linked scan studies.
4 citations
TL;DR: In this article, the synthesis and Claisen rearrangement of methyl γ-aryloxycrotonates have been investigated and a number of them have been successfully rearranged to a mixture of Z and E 3-ethylidenebenzofuran-2(3H)ones in refluxing ethylene glycol.
Abstract: The synthesis and Claisen rearrangement of methyl γ-aryloxycrotonates have been reinvestigated. A number of methyl γ-aryloxycrotonates have been prepared and sucessfully rearranged to a mixture of Z and E 3-ethylidenebenzofuran-2(3H)ones in refluxing ethylene glycol.