Benzylidene compounds

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Benzylidene compounds are, formally speaking, derivatives of benzylidene, although few are prepared from the carbene. Benzylidene acetal is a protecting group in synthetic organic chemistry of the form PhCH(OR)₂. For example, 4,6-O-benzylidene-glucopyranose is a glucose derivative. Benzylidene is an archaic term for compounds of the type PhCHX₂ and PhCH= substituents (Ph = C₆H₅). For example, dibenzylideneacetone is (PhCH=CH)₂CO. Benzal chloride, PhCHCl₂, is alternatively named benzylidene chloride.

Benzylidene is the molecule C₆H₅CH. It is a triplet carbene (CAS RN 3101-08-4). It is generated by irradiation of phenyldiazomethane.{{cite journal|title=Comparison of Phenylcarbene and Phenylnitrene

|author=Platz, Matthew S.|journal=Accounts of Chemical Research|year=1995|volume=28|issue=12|pages=487–92|doi=10.1021/ar00060a004}}