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Methylcobalamin
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<p>Methylcobalamin (mecobalamin, MeCbl, or MeB12) is a <a href="/facts/Cobalamin/vCk613gD">cobalamin</a>, a form of <a href="/facts/Vitamin_B12/vCk613gD">vitamin B12</a>. It differs from <a href="/facts/Cyanocobalamin/3zqceMHz">cyanocobalamin</a> in that the <a href="/facts/Cyanide/t0o8FMKI">cyano group</a> at the <a href="/facts/Cobalt/gqhScEw4">cobalt</a> is replaced with a <a href="/facts/Methyl_group/fkM97EMD">methyl group</a>. Methylcobalamin features an octahedral cobalt(III) centre and can be obtained as bright red crystals. From the perspective of <a href="/facts/Coordination_chemistry/1tCyeQUm">coordination chemistry</a>, methylcobalamin is notable as a rare example of a compound that contains metal–alkyl bonds. <a href="/facts/Nickel/KwMCHYRP">Nickel</a>–methyl intermediates have been proposed for the final step of <a href="/facts/Methanogenesis/5sA0no5A">methanogenesis</a>. </p>