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在有機(jī)化學(xué)中，烷基取代物是缺少一個(gè)氫的烷烴。烷基一詞故意不具體，包括許多可能的取代。無(wú)環(huán)烷基具有通式CNH2N+ 1。環(huán)烷基是由環(huán)烷烴通過(guò)從環(huán)上除去氫原子而得到的，具有通式CnH2n-1。通常烷基是大分子的一部分。在結(jié)構(gòu)式中，符號(hào)R用于指定一個(gè)通用的（未指定的）烷基。最小的烷基是甲基，其分子式為CH3。

按化學(xué)元素
Bx
Cx
Nx
Ox
Fx
Six
Px
Sx
Clx
Brx
Ix
官能團(tuán)： 酚 (3) 芳基 (29) 氯代物 (1) 胺 (13) 羧酸 (18) 含氟砌塊 (1) 碘化物 (1) 醚 (3) 醇 (3) 酰胺 (2) 三氟甲基 (1) 溴代物 (8) 酮 (5) 磺酰胺 (1) 酯 (4) 脂鏈烴 (1) 脂環(huán)烴 (2) 羧酸鹽 (1) 更多
按純度： 99+% 99% 98+% 98% 97+% 97% 96+% 96% 95+% 95% 93% 90+% 90%
按分子量： 0-100 100-200 200-300 300-400 400-500 700-800
按化學(xué)元素： CI CBFNO CBrNOS CFI CClN C CNS CFN CBrNS CCl CBO CS CBrO COS CClFN CNO CBrNO CBOS CNOS CBNO CFNS CNaO CBN CBrCl CO CIN CClNO CBr CN CBrN CFNO CClO CBrS 更多
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