Although facilities capable of creating such conditions exist, there is no published. Even in a vacuum, these molecular chains are too long and tangled to wiggle free into the liquid phase before they. Wood is mostly cellulose, lignin and water.
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Is It Possible to Melt Wood in a Vacuum Chamber? The Wo... Doovi
In theory, it may be possible to melt wood by one alternative means.
If this could be lowered to a temperature that could be attained experimentally, the wood might be able to melt.
At standard temperature and pressure, the melting point of carbon is 3500oc.