Cho, Chang-Woo published the artcileα-Hydroxy Esters via Enantioselective Hydrogen-Mediated C-C Coupling: Regiocontrolled Reactions of Silyl-Substituted 1,3-Diynes. [Erratum to document cited in CA145:335661], Formula: C38H24F4O4P2, the publication is Organic Letters (2007), 9(4), 735, database is CAplus.
On page 3874, in entry 12 of Table 1, the regioisomeric ratio of 3b:3c is 1:>99, not >99:1. Coupling takes place proximal to the tert-Bu group. Acetylenic carbon atoms bearing a Ph moiety possess a characteristic C NMR chem. shift at δ 122-123. The structure of the major regioisomer has been reassigned on the basis of C NMR data.
Organic Letters published new progress about 503538-69-0. 503538-69-0 belongs to dioxole, auxiliary class (Atropisomeric Bisphosphine Ligands, name is (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, and the molecular formula is C38H24F4O4P2, Formula: C38H24F4O4P2.
Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem