A compound having the formula: CF.sub.3 CH.sub.2-w (H.sub.1-x CH.sub.2-y R.sub.m R'.sub.n CH.sub.1-z).sub.p H.sub.2-q CF.sub.3 wherein w=0, 1 or 2; x=0 or 1; y=0, 1 or 2; m=0, 1 or 2; n=0 or 1; z=0 or 1; p=1 or 2; and q=0, 1 or 2; with the provisos that 1.ltoreq.w+x.ltoreq.2, 1.ltoreq.q+z.ltoreq.2, and p.multidot.y=p(m+2n)+(p-1)(x+z)+q+w+x+z-2; and wherein R includes the halogens having an atomic number greater than 9, and radicals having a valence of 1, and wherein R' is a group having a valence of 2, and a process for preparing the compound.
化合物的
化学式为:CF.sub.3 CH.sub.2-w (H.sub.1-x CH.sub.2-y R.sub.m R'.sub.n CH.sub.1-z).sub.p H.sub.2-q CF.sub.3,其中w=0、1或2;x=0或1;y=0、1或2;m=0、1或2;n=0或1;z=0或1;p=1或2;q=0、1或2;前提是1≤w+x≤2,1≤q+z≤2,p.multidot.y=p(m+2n)+(p-1)(x+z)+q+w+x+z-2;其中R包括原子序数大于9的卤素和具有1价的基团,而R'是具有2价的基团,以及制备该化合物的方法。