The Nysted reagent is a reagent used in organic synthesis for the methenylation of a carbonyl group. It was discovered in 1975 by Leonard N. Nysted in Chicago, Illinois. It was prepared by reacting dibromomethane and activated zinc in THF. The process is known as Nysted olefination. There is no confirmed mechanism but a proposed mechanism can be seen to bottom right.

CAS：41114-59-4
中文别名：NYSTED试剂;环-二溴二-μ-亚甲基[μ-(四氢呋喃)]三锌;
英文别名：nysted;Nysted( in THF);
分子式：C6H12Br2OZn3
分子量：456.107
精确质量：449.713
Psa：9.23
Logp：3.4021

PubChem号：24863854
MDL号：MFCD00134567

密度：1.186 g/mL at 25ºC(lit.)
闪点：15 °F

安全说明：S16; S26; S36
危险类别码：R11; R14; R19; R22; R36/37/38
WGK Germany：3
危险品运输编码：UN 3399 4
危险品标志：F; Xn