... R. HARRY CRAGG * and MANIJE NAZERY ** ... m/e 91 0 ther compounds As can be seen from Table 1 there are two features of interest: (a) all com- pounds fia@nent to give a relatively high percentage of the propylene sulphide ion m/e 74 and (b) in the mass spectrum of 2_ethanethio-1,3,%dithiaborinan the cyclic borenium ion (m/e 117) appears to have considerable stability (26.4% cf. ... References 1 RH Cragg, J. Dudman and JPN Husband, J. Organometzd. ...