在有机化学中,烷基取代物是缺少一个氢的烷烃.烷基一词故意不具体,包括许多可能的取代.无环烷基具有通式CNH2N+ 1.环烷基是由环烷烃通过从环上除去氢原子而得到的,具有通式CnH2n-1.通常烷基是大分子的一部分.在结构式中,符号R用于指定一个通用的(未指定的)烷基.最小的烷基是甲基,其分子式为CH3.

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