Carbene - Wikipedia
网页Methylene is the simplest carbene. In organic chemistry, a carbene is a molecule containing a neutral carbon atom with a valence of two and two unshared valence electrons. The general formula is R−:C−R' or R=C: where the R represents substituents or hydrogen atoms.
Carbenes - Chemistry LibreTexts
网页2023年1月23日 · A carbene is a molecule containing a neutral carbon atom with a valence of two and two unshared valence electrons. The general formula is R-(C:)-R' or R=C:. The term "carbene" may also refer to the specific compound H2C:, also called methylene, the parent hydride from which all other carbene compounds are formally derived.
Carbene - Introduction, Singlet and Triplet Carbenes ...
网页A carbene is a divalent carbon atom with two electrons that are not shared with any other atoms. The carbene is called a singlet carbene when the two electrons have opposite spins, and a triplet carbene when they have parallel spins.
Carbene | Reactions, Structure & Uses | Britannica
网页Carbene, any member of a class of highly reactive molecules containing divalent carbon atoms—that is, carbon atoms that utilize only two of the four bonds they are capable of forming with other atoms. Occurring usually as transient intermediates during chemical reactions, they are important chiefly.
Carbene - an overview | ScienceDirect Topics
网页A carbene is a divalent carbon species that contains two nonbonded electrons and six valence electrons. It can exist in either a singlet or triplet state, depending on the spins of the nonbonded electrons. Carbene can have electrophilic or nucleophilic character depending on the adjacent groups.
Introduction: Carbene Chemistry | Chemical Reviews
网页2018年10月10日 · This thematic issue provides reviews on selected topics of the still rapidly developing carbene chemistry. Next to some senior researchers, early career scientists, who will define carbene chemistry in the future, have been invited to contribute.
5: Carbene Reactions - Chemistry LibreTexts
网页A carbene is a neutral form of carbon that has two bonds and two additional electrons. It is highly reactive because it has an incomplete octet with only six electrons around carbon. Carbenes can exist with their nonbonding electrons as either a lone pair or two radicals.