Fujiki, Michiya published the artcileThermo-driven chiroptical switching polysilane featuring 2-cyclopentylethyl side group, Recommanded Product: (2-Bromoethyl)cyclopentane, the publication is Silicon Chemistry (2002), 1(1), 67-72, database is CAplus.
A new rod-like helical polysilane, poly{(S)-3,7-dimethyloctyl(2-cyclopentylethyl)silane}, was found to undergo a thermo-driven, helix-helix transition at -33°C in isooctane associated with the discontinuous changes in the Siσ-Siσ* transition energy and intensity in the transition temperature region. This is the first example of a helix-helix transition polysilane with a cycloalkyl group. A similar rod-like polysilane derivative, poly{(S)-3,7-dimethyloctyl(1-cyclopentylmethyl)silane}, however, did not undergo any helix-helix transition between -61 and 80°C.
Silicon Chemistry published new progress about 18928-94-4. 18928-94-4 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic cyclic hydrocarbon, name is (2-Bromoethyl)cyclopentane, and the molecular formula is C7H13Br, Recommanded Product: (2-Bromoethyl)cyclopentane.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary