に[反「はん」]して/に[反「はん」]し/に[反「はん」]する/に[反「はん」]した => In contrast to A N2
Contrast,Surprise
... 反対に => on the contrary N3
Compare
反面 => while, although; on the other hand~ N2
を契機に => as a good opportunity/chance to N2
Expected
に反して => against; contrary to; in contrast to ~ N2
を[機「き」]に => Use A as an opportunity N1
Time, Situation
…と (は) はんたい (反対)に => opposition; resistance; antagonism; objection; dissent N3
Compare
を[契機「けいき」] => As a good opportunity A, (do) B N2
Information, Report
をきっかけに/を契機に => with… as a start; as a result of; taking advantage of N2