The reaction typically begins with the decomposition of a diazirine compound, which contains a three-membered ring with two nitrogen atoms and a carbene-like center. When subjected to heat or other suitable conditions, diazirines can undergo homolytic cleavage of the N-N bond, generating two nitrogen-centered radicals and a highly reactive carbene intermediate. This carbene can be either a singlet carbene (with paired electrons) or a triplet carbene (with unpaired electrons).
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