This reaction involves two successive Michael reactions, and has the following steps: 1. Deprotonation forms enolate ion 1; 2. The first Michael reaction forms enolate ion 2; 3. The second Michael reaction forms enolate ion 3; 4. Protonation leads to the final product. Write the mechanism out on a sheet of paper, and then draw the structure of enolate ion 2.

Ibelieve the answer is d. titaniumhope my answer has you : )

Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f. 

Answertheir requirement for travel through the bloodstream.