C 3050 (OTTO) Cyclopropylmethyl bromide, 97% Cas 7051-34-5 - used in the synthesis of 1,4-dienes by iron-catalyzed cross-coupling with alkenyl Grignard reagents. C 3050 (OTTO) Cyclopropylmethyl bromide, 97% Cas 7051-34-5 - used as a synthetic building block for the introduction of the cyclopropylmethyl group.