A gas-phase formation route is proposed for the recently detected propargylimine molecule. In analogy to other imines, such as cyanomethanimine, the addition of a reactive radical (C₂H in the present case) to methanimine (CH₂NH) leads to reaction channels open also in the harsh conditions of the interstellar medium. Three possible isomers can be formed in the CH ₂ NH+C₂H reaction: Z- and E-propargylimine (Z-,E-PGIM) as well as N-ethynyl-methanimine (N-EMIM). For both PGIM species, the computed global rate coefficient is nearly constant in the 20–300 K temperature range, and of the order of 2–3נ 10⁻¹⁰ cm³ molecule⁻¹ s⁻¹, while that for N-EMIM is about two orders of magnitude smaller. Assuming equal destruction rates for the two isomers, these results imply an abundance ratio for PGIM of [Z]/[E] ∼1.5, which is only slightly underestimated with respect to the observational datum.

对于最近检测到的炔丙胺分子，提出了气相形成路线。与其他亚胺（例如氰基甲亚胺）类似，向甲胺（CH ₂ NH）中添加反应性自由基（当前为C ₂ H ）会导致在星际介质的苛刻条件下打开反应通道。在CH ₂ NH + C ₂ H反应中可以形成三种可能的异构体：Z-和E-炔丙胺（Z-，E-PGIM）以及N-乙炔基-甲亚胺（N-EMIM）。对于这两种PGIM物种，在20–300 K的温度范围内，计算出的整体速率系数几乎恒定，约为2–3נ 10 ^-10 cm ³分子^-1 s ^-1 ，而N-EMIM的值要小两个数量级。假设两种异构体的破坏率相等，则这些结果意味着PGIM的丰度比为[Z] / [E]〜1.5，相对于观测数据仅稍有低估。