TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Preparation of (I) involves combining 1-monoacyldipyrromethane with a boron compound of formula R1R2MX (II).X=anion leaving group.The combining step is carried out by combining a mixture containing 1-monoacyldipyrromethane with (II). The combining step is carried out in a solution and the metal complex is solubilized or suspended in the solution where the method further involves combining the metal complex with a hindered alkyl amine base in an organic solvent to form a solid comprising the metal complex; and then separating the solid from the organic solvent. The method further involves decomplexing the 1-monoacyldipyrromethane from the metal complex by combining the metal complex with hydroxide, alcohol and/or water. (II) Is immobilized on a solid support where the method further involves releasing (I) from the solid support.Preferred Method: In (M1), the reducing step is carried out with NaBH4 in an organic solvent. In (M2), the base is the deprotonated form of a compound selected from tetraalkylpiperidine, dicycloalkylamine and disilzane; the base is present and added as a preformed base; base is formed in situ, and where the conjugate acid of the base has a pKa less than that of the conjugate acid of the Grignard reagent; and the base is present or absent, and where the Grignard reagent is a hindered Grignard reagent. (M2) Further involves decomplexing the 1,9-diacyldipyrromethane from the metal complex by combining the metal complex with hydroxide, alcohol and/or water to form a product. (M2) Further involves combining the product with a compound of the formula R1R2M'X'2 in the presence of a base to form a metal complex of the formula DM'R1R2 in the mixed reaction product, where DH2 is the 1,9-diacyldipyrromethane; and then separating the metal complex from the mixed reaction product. (M2) Further involves reducing the metal complex with a reducing agent to form a diol from the 1,9-diacyldipyrromethane; and then condensing the diol with a dipyrromethane to form a porphyrin ring compound from it where the reducing agent is NaBH4. The substituting step is a halogenating step. (M3) Further involves forming a carbinol reduction product of the 1-acyl-9-substituted dipyrromethane boron complex; then condensing the carbinol reduction product with a chlorin western half in an organic solvent in the presence of an acid to form a condensation product; and then oxidatively cyclizing the condensation product to produce a chlorin. The oxidatively cyclizing step is carried out in an organic solvent in the presence of a base, an oxidant and a metal salt.M'=Sn, Si, Ge, or Pb;andX'=halo, OAc, acac or OTf.Preferred Components: The hindered alkyl amine base is triethylamine, diisopropylethylamine or triphenylamine. The solvent is dichloromethane. (I) Is in solid form or crystal solid form. EXAMPLE - A solution of dipyrromethane (0.731 g) in tetrahydrofuran (THF) (10 ml) at room temperature under argon was treated with EtMgBr (12.5 ml) for 10 minutes. The solution was cooled to -78degreesC. Then a solution of 4-methyl-thiobenzoic acid S-pyridin-2-yl ester (1.15 g) in THF (5 ml) was added. The reaction mixture was stirred at -78degreesC for 10 minutes and at room temperature for 20 minutes and worked up to obtain 1-(4-methylbenzoyl)dipyrromethane (2b) (0.812 g, yield 62%). A solution of (2b) (0.529 g) in dichloromethane (4 ml) was treated with triethylamine (TEA) (0.670 ml) followed by trifluoro-methanesulfonic acid 9-bora-bicyclo(3.3.1)non-9-yl ester (8 ml). After 30 minutes, the mixture was passed through a pad of silica eluting with dichloromethane and worked up to obtain yellow-orange solid of 10-(9-borabicyclo(3.3.1)non-9-yl)-1-(4-methylbenzoyl)dipyrromethane (0.696 g, yield 91%).