β Scribed by Gurdial Singh
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π SIMILAR VOLUMES
PMR spectra of thirty-eight chloromethylthiopliene and seven dithienylmethane derivatives were observed at 60 or 40 MHz. The cheniical shifts of methylene protons were 4-63 to 5.25 ppni for monosubstituted 2-chloromethylthiophenes and 4.37 to 4.56 ppm for inonosubstittited 3-chloromethylthiophenes,
Proton and boron-1 1 magnetic resonance spectra for several potassium para-substituted tetraarylborate compounds [KB(C6Ha-pX)4, where X is H, OCH,, CHa, Br, C1, F, CF,] have been obtained. The chemical shift between the centers of the AA' and XX' multiplets for the ring proton multiplets, relative t
This paper is devoted to a comparative study, performed by means of NMR, of properties and behaviour of an homologous series of polyalkenamers and of some ethylene-propylene copolymers. It was observed that, in polyalkenamers, the chain mobility depends on the number of methylene groups present betw