Abstract: A method of incorporating fluorine into the YBa.sub.2 Cu.sub.3 O.sub.7-x system by annealing YBa.sub.2 Cu.sub.3 O.sub.7-x powder in a fluorine-containing gas, especially NF.sub.2 gas. The YBa.sub.2 Cu.sub.3 O.sub.7-x material is annealed in the fluorine-containing gas (either pure NF.sub.3 or NF.sub.3 /O.sub.2 blend of F.sub.2 /N.sub.2 blend) at a temperature which allows sufficient reactivity with the fluorine gas while maintaining the system well below temperatures at which oxygen incorporation is observed to take place in the normal YBa.sub.2 Cu.sub.3 O.sub.7-x system.

Abstract: This invention relates to organic materials normally susceptible to gradual degradation in the presence of oxygen during use over an extended period of time and of the type in which it is customary to add an antioxidant thereto to prevent degradation. The improvement constituting the basis of this invention comprises including an alkenylated toluenediamine having one alkenyl group ortho to an amine group. More particularly, the alkenylated toluenediamines suited as antioxidants are represented by the formulas: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, C.sub.1 to C.sub.3 aliphatic, or R.sub.1 and R.sub.2 or R.sub.3 are bridged via an alkylene radical --(CH.sub.2).sub.y -- wherein y=2 to 5, and at least one of R.sub.1, R.sub.2, R.sub.3, R.sub.4 or R.sub.5 is C.sub.1 or greater.