Answers are grounded in this paper and cite their sources.
A broad band at λmax ≈ 620 mm confirms the singlet character of the carbene 1, since no other conceivable compounds in the system should absorb in this region. Moreover, calculations on dialkylcarbenes yield similar λ values. Compound 1 rearranges photochemically to 2, and on warming in a CO-doped argon matrix it affords 3.
No takes yet. Share an insight, caveat, or question.
Bally et al. (1994) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: