A very efficient short synthesis of resveratrol was reported in 2006. Fill in reasonable reagents for steps

Question:

A very efficient short synthesis of resveratrol was reported in 2006. Fill in reasonable reagents for steps (a) through (d). Refer to the referenced text sections as needed.

CH,CO, HO HO (a) (b) -СНО -CH=CH2 CH=CH, Section Sections 17-12 19-9, 20-3 НО НО CH;CO CH;CO (c) (d) -CH=CH- OCCH3 → resveratrol Section Section 13-9 20-4 CH;CO