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It is well precedented that IMDAF reactions lead to equilibrium mixtures of starting materials and cycloadducts.

Perceived Organisational Justice as a Predictor of Employees’ Motivation to Participate in Training

However, all these methods are less preferable when a broad synthetic methodology is required, particularly to build a library of variously substituted furans for studying structure– activity relationship.

Although these products
can in principle be prepared by enantioselective
Diels–Alder reactions of furan and acrylate derivatives,
the low reactivity of furan, poor conversions and the
occurrence of side reactions have made this approach
problematic. In fact, only a few examples of catalytic
asymmetric Diels–Alder reactions of furans and acrylate
derivatives have been reported.

Chiral 7-oxabicyclo[2.2.1]hept-5-enes, 1 are attractive
precursors for the synthesis of various important natural
products such as pseudo-sugars,1 shikimic acid,2 transkumausyne,
3 and epoxyquinols.4

We describe the histological structure of the eyes of Misumenops pallens (Araneae, Thomisidae).
We have carried out frontal, sagittal and transverse histological sections of the eyes. All the eyes
have cuticular and laminar corneas and lenses. The anterior median eyes have two cellular types in the
rhabdom; the remaining eyes have three cellular types.