Are there alternatives to osmium (CAS: 7440-04-2) in synthesis?

Alternatives to osmium (CAS: 7440-04-2) in catalytic cross-coupling reactions include palladium-based catalysts and other precious metals like rhodium. For substitution reactions, alternatives like transition metal complexes and organometallic compounds are available. The choice depends on the specific reaction conditions and desired product purity.详尽的信息需要具体上下文和详细研究，但上述概述了主要的替代方案。