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.

卡宾（Carbene），又称碳宾、碳烯，是H2C:和它的取代衍生物的通称。 通常由含有容易离去基团的分子消去一个中性分子而形成。 与碳自由基一样，属于不带正负电荷的中性活泼中间体。

稳定卡宾（Persistent carbene），包括氮杂环卡宾和其他具有特殊稳定性的卡宾，可作有机金属化学中的辅助配体。 类卡宾 ，有时专指 有机锌化合物 （ICH 2 ZnI）一类的物质，由二卤甲烷（ 二碘甲烷 ）与 锌铜偶 （Zn(Cu)）生成。

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.

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 …

2023年9月26日 · A carbene is a molecule that has a neutral carbon atom with a valence of two and two unshared valence electrons. They are neutral transitory carbon intermediates. They have two valence electrons that are not shared, as well as a neutral carbon atom with a valency of two.

2020年8月18日 · 卡宾Carbene，又称碳宾、碳烯。 一般以R2C：表示，指碳原子上只有两个价键连有基团，还剩两个未成键电子的高活性中间体。 通常由含有容易离去基团的分子消去一个中性分子而形成。

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

卡宾体 (carbene)，又称碳烯，一般以R2C：表示，指碳原子上只有两个价键连有基团，还剩两个未成键电子的高活性中间体。 卡宾的寿命远低于1秒，只能在低温下(77K以下)捕集，在晶格中加以分离和观察。

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.