Tetradentate diaminodiphosphine ligand and transition metal complex, and method for manufacturing same and application for same

A compound represented by general formula (1) or a Bronsted acid salt thereof:

• wherein R12, R13, R14, R15, R16, R17, R18 and R19 each represent a hydrogen atom,
• U represents a group represented by the following general formula (2A):
• wherein the solid line intersected with the wavy line represents a binding hand to the adjacent atom,
• Q1 is ethylene group,
• R20 represents a hydrogen atom,
• G and G′ each represent a group represented by the following general formula (GP):
• wherein the dotted line represents a coordinate bond, and the solid line intersected with the wavy line represents a binding hand to the adjacent atom,
• L represents a lone electron pair or BH3, and
• R1 and R2 each independently represent an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted alkenyl group, an optionally substituted alkynyl group, an optionally substituted aryl group, an optionally substituted heteroaryl group, an optionally substituted aralkyl group, an optionally substituted alkoxy group, an optionally substituted aralkyloxy group or an optionally substituted amino group.