In the title compound, C(23)H(34)O(4)·0.5C(2)H(6)O, which was isolated from acrylic modified rosin, the endocyclic compound adopts a tetra-cyclo-[10.2.2.01,10.04,9]hexa-decane structure. In the crystal, the components are linked by O-H⋯O and C-H⋯ hydrogen bonds.

A highly efficient diastereo- and enantioselective Mannich reaction of lactones with a variety of N-Boc-aldimines by using bifunctional rosin-derived amine thiourea catalysts was investigated for the first time, in general, affording the adducts bearing quaternary stereogenic centers with high levels of enantio- and diastereoselectivity (up to 99% ee, and >20:1 dr).

Test printed circuit test boards (PCBs) with various surface finishes were subjected to a mixed flowing gas environment with gaseous composition adjusted to achieve a targeted 500600 nm/day copper corrosion rate. Board surface finishes included immersion silver (ImAg), organic solderability preservative (OSP) and lead-free hot-air-solder leveling (Pbfree HASL). The PCB test specimens were prepa...

This report describes a number of new synthetic approaches towards methyl-substituted mono- and diepoxy alcohols that serve as substrates for endo-selective epoxide-opening cascades. The key transformations involve the manipulation of alkynes. Highlighted are the directed methylmetalation of bishomopropargylic alcohols, the bromoallylation of alkynes, and Pd-catalyzed cross-coupling between an ...