* Mashreq Bank unit buys 51 pct stake in Turkish arm

* Remaining stake bought by ex-AIG CEO's firm

* Turkey seen attractive to foreign insurers

* Dubai Group is in midst of $10 bln restructuring

DUBAI, Sept 4 (Reuters) - Dubai Group has sold its Turkish insurance arm to a company owned by former AIG AIG.N chief executive Maurice "Hank" Greenberg and a unit of Dubai lender Mashreq Bank MASB.DU , as the state investment firm looks to cut its debt pile.

Oman Insurance Co OIC.DU , the unit of Mashreq, said on Tuesday it had bought a 51 percent stake in Dubai Group Sigorta, an insurance company based in Istanbul which does non-life insurance business.

The remaining 49 percent was acquired by Starr Insurance and Reinsurance Ltd, part of Greenberg's Starr International Co, OIC said. No financial details of the transaction were provided.

Dubai Group, part of Dubai Holding DUBAH.UL , the personal investment firm of Sheikh Mohammed bin Rashid al-Maktoum, was hit hard by the global financial crisis and has seen the value of most of its holdings decline.

Like most other state-linked entities in the emirate, it embarked on talks with creditors to restructure debt and extend maturities.

Its financial assets include stakes in Egypt's EFG Hermes

HRHO.CA , an investment bank hit by Middle Eastern turmoil, and Cyprus Popular Bank CPBC.CY , formerly Marfin, whose recapitalisation forced Cyprus to seek an international bailout.

Dubai Group also has a stake in Borse Dubai, which owns 20.6 percent of the London Stock Exchange.

Penetration rates for the insurance sector in the Middle East remain low compared with developed markets, with operators under increasing pressure to boost efficiency, roll out new products and explore new markets.

Turkey, the fastest expanding economy in Europe with growth of 8.5 percent last year, is seen as attractive to foreign insurers looking to diversify away from competitive and mature home markets. ID:nL6E8IC15S]

Dubai Group Sigorta was formed in 2008. It made a loss of 34.2 million Turkish lira ($18.8 million), according to its 2011 annual report.

($1 = 1.8185 Turkish liras)

(Reporting by Dinesh Nair; Editing by Mark Potter)

((dinesh.nair@thomsonreuters.com)(+ 971 4 366 4265)(Reuters Messaging: dinesh.nair.reuters.com@reuters.net))

Keywords: DUBAIGROUP OMAN/SALE