Liquid crystal medium and liquid crystal device

The invention relates to a compound of formulae (I') to (I'"), R11(-A11-Z11)o-A12(-Z12-A13)p-X11-Sp-X12-(A14-Z13-)q A15-(Z14-A16-)rR12 (I'), A12(-Z12-A13)p-X11-Sp-X12-(A14-Z13-)q A15-(Z14-A16-)rR12 (I"), A12(-Z12-A13)p-X11-Sp-X12-(A14-Z13-)q A15 (I'"), wherein R11, R12, A11 to A16, Z11 to Z14, X11, X12, Sp, o, p, q and r have one of the meanings as given herein below. The invention further relatesto method of production of a compound of formulae (I') to (I'"), to the use of said compounds in LC media and to LC media comprising one or more compounds of formulae (I') to (I'"). Further, the invention relates to a method of production of such LC media, to the use of such media in LC devices, in particular, flexoelectric LC devices and to a flexoelectric LC device comprising a LC medium according to the present invention. 本发明涉及式(I')至(I"')的化合物R(-A-Z)-A(-Z-A)-X-Sp-X-(A-Z-)A-(Z-A-)R(I')；A(-Z-A)-X-Sp-X-(A-Z-)A-(Z-A-)R(I")；A(-Z-A)-X-Sp-X-(A-Z-)A(I"')。其中R、R、A至A、Z至Z、X、X、Sp、o、p、q及r具有下文中所给定的含义之一。本发明另外涉及一种制备式I的化合物的方法、所述化合物在