It has been shown recently2 that triphenylvinyl bromide reacts with magnesium to form a Grignard reagent which can be carbonated to give triphenylacrylic acid. The present paper describes the results obtained in simi. lar reactions where certain substituted triphenylvinyl bromides were used Two disubstituted triphenylvinyl bromides were studied: a-phenyI-P, P- di-p-tolylvinyl bromide (I, R= CH3) and a-phenyl-P, p-di-p-anisylvinyl bromide (I, R= OCH3 ...