  A search for the standard model (SM) Higgs boson (H) produced with transverse
momentum greater than 450 GeV and decaying to a charm quark-antiquark
($\mathrm{c\bar{c}}$) pair is presented. The search is performed using
proton-proton collision data collected at $\sqrt{s}$ = 13 TeV by the CMS
experiment at the LHC, corresponding to an integrated luminosity of 138
fb$^{-1}$. Boosted H $\to$ $\mathrm{c\bar{c}}$ decay products are reconstructed
as a single large-radius jet and identified using a deep neural network charm
tagging technique. The method is validated by measuring the Z $\to$
$\mathrm{c\bar{c}}$ decay process, which is observed in association with jets
at high $p_\mathrm{T}$ for the first time with a signal strength of 1.00
$_{-0.14}^{+0.17}$ (syst) $\pm$ 0.08 (theo) $\pm$ 0.06 (stat), defined as the
ratio of the observed process rate to the standard model expectation. The
observed (expected) upper limit on $\sigma$(H) $\mathcal{B}$(H $\to$
$\mathrm{c\bar{c}}$) is set at 47 (39) times the SM prediction at 95%
confidence level.
