No, there is no buprenorphine in xanax. Xanax is alprazolam, while buprenorphine is a generic name for Buprenex, also going by the trade name Subutex or Suboxone when mixed with naloxone.
Alprazolam is a sedative/hypnotic in the class of benzodiapines and is used for the control of acute anxiety.
Buprenorphine is a schedule III opioid narcotic used typically for the treatment of chronic pain or prevention of relapse in opioid addicted individuals.