Cyclopropene is the last of the small strained ring hydrocarbons to have its thermal decomposition subjected to intensive investigation. This critical review describes the nearly 40 year history of this investigation largely by gas kinetic methods with chromatographic analysis. These studies have revealed that cyclopropenes can decompose by a variety of mechanisms involving diradicals, vinylcar...

In the crystal structure of the title compound, C(22)H(25)NO(4), inter-molecular O-H⋯O hydrogen bonds involving the hy-droxy group of the 4-(amimometh-yl)phenol fragment and the C=O group connect the mol-ecules into infinite chains along the c axis. Two C atoms of the propyne group are disordered over two sites with occupancy factors of 0.53 (2) and 0.47 (2).

In the title compound, C11H10O3, there is an intra-molecular O-H⋯O hydrogen bond generating an S(6) ring motif. The O atom of the hy-droxy group deviates by 0.0200 (1) Å from the benzene ring to which it is attached. The propyne group is almost linear, the C-C C angle being 177.83 (15)°, and is almost coplanar with the benzene ring; the C-C-O-C torsion angle being only -1.1 (2)°. In the crystal...

In the title compound, C(10)H(8)N(2)S, the 2-amino-benzothia-zole and propyne groups are not coplanar [dihedral angle = 71.51 (1)°]. The crystal structure is stabilized by strong inter-molecular N-H⋯N hydrogen bonds and C-H⋯C, C-H⋯π and F-type aromatic-aromatic [centroid-centroid distance = 3.7826 (12) Å] inter-actions are also observed.

In the title compound, C(20)H(18)N(2)O(3), the indole unit is essentially planar, with a maximum deviation of 0.0197 (18) Å for the N atom and forms a dihedral angle of 78.09 (9)° with the propyne-subsituted phenyl ring. The propyne group is almost linear, the C-C C angle being 176.5 (2)°, and is also in the flagpole position on the O atom. In the crystal, mol-ecules are linked via N-H⋯O and C-...

Crossed molecular beam experiments were utilized to untangle the reaction dynamics to form 1-phenylmethylacetylene [CH(3)CCC(6)H(5)] and 1-phenylallene [C(6)H(5)HCCCH(2)] in the reactions of phenyl radicals with methylacetylene and allene, respectively, over a range of collision energies from 91.4 to 161.1 kJ mol(-1). Both reactions proceed via indirect scattering dynamics and are initiated by ...

. The nature of the formation allene and methylacetylene during dehydrochlorination 1,2-dichloropropane intermediate products (1-chloropropene-1, 2-chloropropene-1, 2-chloropropane, 3-chloropropene-1) on γ-Al2O3, CaX expanded clay made it possible to establish that main source is - 1-chloropropene-1, γ -Al2O3, appears mainly from 2-chloroprene. highest value allene: ratio was obtained 1,2-dichl...

The crossed molecular beam technique was utilized to investigate the reaction of ground state carbon atoms, C~Pj!, with d3-methylacetylene, CD3CCH~X A1!, at an average collision energy of 21.1 kJ mol. Product angular distributions and time-of-flight spectra were recorded. Only the deuterium loss was observed; no atomic hydrogen emission was detected experimentally. Forward-convolution fitting o...

The reaction between the ethynyl radical, C2H (X S), and methylacetylene (X A18), which yields ethynylallene, pentadiyne, and butadiyne, has been studied at the density functional ~B3LYP/6-3111G**! and coupled cluster ~coupled-cluster single double perturbative triple/ cc-pVTZ! levels of theory. These results agree with data from crossed molecular beam experiments where ethynylallene ~10! and p...