Benzaldehyde from sorbitol and ascorbic acid?

During my experiments with molten mixtures of ascorbic acid and sorbitol I found - if the mixture was heated to a certain temperature range - that a liquid condensed on the cooler parts of the glas which had a strong and sweet odor of bitter almond.
The experiment was then repeated with a distillation apparatus as shown below. The result after heating the mixture for 10 minutes at 140°C was a tar like residue and a yellowish liquid distillate. The distillate had a strong odor of  bitter almond, the residue a caraway odor.

It could be also possible that salicylaldehyde or furfural has been synthesized as it has a bitter almond odor too.
Unfortunately the Fehling test was negative for the distillate as it is not sensitive enough for such small amounts.

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