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The Tebbe reagent is the organometallic compound with the formula (C5H5)2TiCH2ClAl(CH3)2. It used in the methylenation of The Tebbe reagent methylenates carbonyls without racemizing a chiral α carbon. — “Tebbe's reagent - Wikipedia, the free encyclopedia”, en.wikipedia.org
Biocatalysis underpins some of the oldest chemical transformations known to humans, for brewing predates recorded history. the two substrate- enantiomers are racemizing continuously, all substrate may in theory. — “Biocatalysis - Wikipedia, the free encyclopedia”, en.wikipedia.org